Process of dyeing pelts, hairs, feathers, and the like



Patented Oct. 21, 1930 UNITED. STATES; PATENT OFFICE RAUL VIBCK, OFDESSAU IN .ANHALT, GERMANY, ASSIGNOR TO GENERAL ANILINE WORKS, INC., OFNEW YORK, N. Y., A CORPORATION OF DELAWARE PROCESS OF DYEING PELTS,HAIRS, FEATHERS, AND THE LIKE R Drawing. Application filed December 6,1927, Serial No. 238,221, and in Germany September 14, 1926.

to the general formula:

x x 1 CuYHoNIF-QX X NH;

wherein X means H, alkyl or halogen and Y stands for H, -OH, -NH orNH-arylNI-I The not mordanted goods are treated with an aqueous solutionof a salt of such a 3- amino-arylamino-derivative of the naphthalene andthen with an acid nitrite solution, whereby valuable dyeings areproduced on the fiber. For example, a thoroughly killed 3 skin ishandled at ordinary temperature for some hours in a bath containing perliter 2 gr.

of2- (3-aminophenylamino) -naphthalenehydrochloride, some alcohol and asmall proportion of hydrochloric acid. It is then washed and handle in asecond bath containing per liter 3 grams of sodium nitrite and 6 gramsof acetic acid per liter. The dyeing is between yellow and rose.

2- (4-methyl-3-aminophenylamino) -naphthalene produces a similarvdyeing, 2- (4'- methyl- 3 -aminophenylamino) 7 hydroxynaphthaleneproduces a reddish-brown dyemg.

Similar' dyeings are obtained from the naphthalene derivatives mentionedwhich are substituted in the benzol nucleus by halogen.

What I claim is 1. A process of dyeing pelts, hairs and feathers bysuccessively treating the goods with an aqueous solution of a salt of anaphthalene derivative of the general formula:

C mYHeNH X I X NH;

(wherein X means H or an univalent substituent of the group consistingof alkyl and halogen), and with an acid nitrite solution.

3. A process of dyeing pelts, hairs and feathers by successivelytreating the goods with an aqueous solution of 2-(3-aminophenylamino)naphthalene hydrochloride and with an acid nitrite solution.

In testimony whereof, I affix my signature. 80

PAUL VIROK.

